Safety means for swaging machines



C. T. BRENNAN Filed Feb. 14, 1954 SAFETY MEANS FOR SWAGING MACHINES Jan. 29, 19.35.

Patented Jan. 29, 1935 10 parts of the'flmechanism or the tools become brokenor seriously damaged. j invention relatesto meanswhi'ch is particularly adaptedior'machines of the, class, meni n d ha wi 'i ii m an r andv Wit l5 noisefexcessive wear of undue strain render the actuatingmechanism ineffective when conditions occur which willinterfere with the normaloperation of the machine. i The invention is adaptable to the connections 20 between'the driving mechanisms and .thetools of varioustypes ofmetal forming machines.- 1 For the purpose of disclosing a concrete embodiment the conception is herein illustrated and described as'designed ior'applicationto the cut-oifmech- 85 anismof-a-machine in'which a rod" is entered and sections of its end cut ofi and carried into line with a'cooperating punch and die'that have complementary shapes" for conforming-the severed pieces. In this-machine-theend of the rod is 80 severedand carried into. line with-thetools by a cutter on -a' bar that 'is reciprocated by a slide which is connected with -a yokeon an eccentric disk rth'atfis driven by a crank operated from o, the driving shaft of the machine. In carrying 35 out this invention the eccentric disk is operative 1y fastened to the yoke by a pin thathas suificient--strength to withstand "all normal strai1i s-;but- --which' will besheared on' the occurrence of-excessive strain resulting from accidenta1- conditionsiand allow the disk to turn in the yoke-and become locked with the-disk-and yoke-in such relation that their throwwill be-shortened from the normal throw. e In the"' accompanying drawing Fig. lshows a plan-view of-a-swaging machine with a safety mechanism which embodies this invention ---ap'- plied between the main shaft and the cutting off tO1's1ide.-., .L. 1 :11. J

Fig. 2 shows on larger scale a top view of the safety mechanism.

Fig. 3 shows a side view of the safety mechanism illustrated in Fig. 2.

Fig. 4 is a face view of the eccentric disk and yoke with portions broken away to expose the normal connections between the disk and yoke.

1 9 9,397 SAFETYMEANS R AGIN 'Acnmas Cheshire, I I Aiiplicafionrebruaif i i, i93gQS e1-ial'No. 17 11, 9

(61. 29-34) i i v i I Inthe views only of the frame of a machine of well known type as is necessary to an understanding of the application-of the'xin- Mention,.is .-i1lustratedmSet in t et of the -frame of. this: machine is. a; die; 2 coacting with .whichv f r shaping the blanks. is a punch 3 that is reciprocatedgat the proper ztimesfby the usual mechanism. -The rod of-stock 4 is advanced by the ordinary feeding-:m'eans through an opening :inthe frame audits-inner end "is cut ofi bythe inward movement of a-cu-tter blade -6, and thesevered piece -is,qby the cutter blade assisted by the backing blade -7, carried-into line with the punch and ,die by Which the blank is to be. con formed. Q f-; ;I 1 .L; The backing; blade is shown asfastened towa bar 8 that is moved'in and out by the angle lever 9 which is connected byra' link 10' with levers, 11 that-are actuatedbycams 12 on themainishaft 13, after :-the manner set forth inyPatenti-No. 1,897,359. issuedv to .me Feb. 14. 1933. The cutter blade; is.illustrated as secured .to abar 14; th,at is moved in an out-by the-actiony-of:thecam groove 15 in the slide 16 as ,described in Batent No. 1,857,997 issued to me MaylO, 1 932=.. .fi on the outer end .ofthe mainshaftisa balsance wheel 17 and fastened'to this wheel'risa crankdisk 18 extendingvfrom which; is: a crank pin 19; This crankpin engagesaanueccentric disk-20 that is movably'fitted in asyoke. 21 which is connected by a link, 22with the cutter'bar' slide 16. The eccentric disk-and yoke are'normally held in fixed relation" by a pin a 23 that .isatightly. fitted in a hardened bushing 24 in the disk :and a hardened bushing 25 in the-yoke. ti ,When the machine is operating normaliyathe rotation ofthe crank, through the eccentricvdisk and connected yoke, thelinkzand camslide, "reciprocates. thecutter bar and causes 'the cutter to sever-the end of the stock rod and fcarryxthe blank-thus produced .into line with the punch and die, and then return v for cutting afollowing piece of the stock. -However I should there be" an irregularity in thefeedof the stock iii-1a, fault; in the blank, or should the blank become jammed in or'-betweenthe--punch and die, :or ifcfor any other; reason there; should .be' iinterference-rwith';

or; ObfitlfllCtiOIlgztO; thezproper-sactionrof athe tools which offers excess resistance, the pin 23 will be sheared by the bushings 24 and 25 leaving the eccentric disk free to rotate in the yoke. When the eccentric and yoke are disconnected the effective throw of the crank is reduced to such an extent that the cutter bar is not reciprocated sufiiciently for the cam to force the cutter in between pressed pin 27 may be inserted through the yoke so as to project into this slot. The slot is long enough to allow the disk to go forward in the direction of shear the required amount to withdraw the cutting tool. At the end of the slot is a socket 28 into which the inner end of the pin will enter and again lock the disk and yoke together. With the disk-and yoke locked in this relation their throw will be shortened and the throw of the crank will not be sufiicient to again carry the cutter between the tools.

The invention claimed is:-

1; In combination with the driving mechanism and conforming tools of a machine of the character mentioned, a safety means comprising a crank-rotated by the driving mechanism, an eccentric disk operatively engaged by said crank, a yoke fitted about said disk,-meanslocking said disk to said yoke in one relation for normal ac tlon and locking the disk to the yoke in another relation upon interference with normal'action of the tools, tool actuating means, and a connection between said yoke and said tool actuating means.

2. In combination with the driving mechanism and conforming tools of a machine of thecharacter mentioned, a safety means comprising a crank rotated by the driving mechanism, an eccentric disk operatively engaged by said crank, a yoke fitted about said disk, a frangible pin extending through the yoke into the disk and normally locking said disk to said yoke, tool actuatingmeans, and a connection between said yoke and said tool actuating means. v

3. In combination with the driving mechanism and conforming tools of a machine of the character mentioned, a safety means comprising a crank rotated by the driving mechanism, an eccentric disk operatively engaged by said crank, a yoke fittedabout said disk, frangible means insertable through the yoke into the disk and normally locking said disk to saidyoke, a cam slide for causing the action of a tool, and a connection between said yoke and said slide.

4. In combination with the driving shaft and forming tools of a machine of the character mentioned, a safety means comprising a crank at tachedto the driving shaft, an eccentric disk operatively engaged by said crank, a yoke fitted about said disk, complementary bushings located in the disk and yoke, a frangible pin extending through said bushings andlocking said disk to said yoke, tool actuating means, and a connection between said yoke and said tool actuating means.

5. A safety means connecting the driving mechanism with tools of a machine of the character mentioned, which comprises acrank, an

eccentric disk operatively engaged by said crank, a yoke fitted about said disk, and means locking said disk to said yoke and normally causing full throw of the eccentric and under abnormal conditions shortening the throw of the eccentric.

6. A safety means connecting the driving mechanism with tools of a machine of the character mentioned, which comprises a crank, an cecentric disk operatively engaged by said crank, said disk having a groove extending part way around its periphery, a yoke fitted" about said disk, frangible means locking'said disk'to said yoke, and a pin extending through the yoke into said groove. Y

7. Safety means interposed between the driving mechanismand tools of a metal conforming machine, which comprises a crank, an eccentric disk operatively engaged by said crank, a yoke fittedabout said disk, frangible means normally locking said disk to said yoke, said disk having a groove and locking socket, and ,a pin extending through the yoke into said groove [andadapted to enter said socket'for locking the disk and yoke in a different. relation ,fbllowing the rupturepf said frangible means.

8. Safety means interposed in}! mechanism and tools of arnetal conforming machine,-which comprises a crank, an eccentric disk operatively engaged bysaid crank, a: yoke fitted about said disk, frangiblemeans normally locking said disk to said'yoke, said, disk havinga locking socket in its periphery,'and a pin. extending, through the yoke'and adapted to entenfsaid socketifor locking the disk and yoke in a differ ent relation following the rupture of said frangible means. 7.

, 9. Safety means interposed between the driving mechanism and tools of a metal-conforming machine, which comprises a crank, an eccentric disk operativelyengaged' by saidcrank, a yoke fitted about said disk with frangible means normally tively engaged by said crank, means connected to the tool slide and actuated by said disk,.a frangible pin normally locking said means to the disk in one relation to the crank, and a pin adaptedto lock said means to the-disk in a different relation to the crank upon the rupture ,of said frangible pin f 11. Means for converting rotatory motion into reciprocatory motion which comprises a'rotatable crank, a disk eccentrically connected with and adapted to be rotated by the crank, and means connected by a frangible memberwith the disk and adapted to be reciprocated by the combined effect of the crank and disk under normal conditions, and said frangible member intact and mm reciprocated by the effect of the crank onlyunder abnormal conditions and said frangible member fractured.-

CHARLES 'I. BRENNAN. 

